Collect them all!
Anatomy of the State
https://amzn.to/42z9OHQ
What Has the Government Done to Our Money?
https://amzn.to/42FLUKY
The Ethics of Liberty
https://amzn.to/3RJyDuy
For a New Liberty: The Libertarian Manifesto
https://amzn.to/3YXgEEG
(affiliate)